public virtual Task <AddPersistedFaceResult> AddPersonFaceAsync(string personGroupId, Guid personId,
                                                                 string imageUrl, string userData = null, Rectangle targetFace = null)
 {
     return(PolicyService.ExecuteRetryAndCapture400Errors(
                "FaceService.AddPersonFaceAsync",
                ApiKeys.FaceRetryInSeconds,
                () =>
     {
         var result = FaceRepository.AddPersonFaceAsync(personGroupId, personId, imageUrl, userData, targetFace);
         return result;
     },
                null));
 }